It just occurred to me that the Switch 2’s MouseMode could be the only control method that the Steam Deck is “missing.” I would absolutely love to be able to play DOOM or Halo: MCC or Overkill from the couch. This would be the only thing I’d like more than the rumored Steam Controller 2 design.
Any Bluetooth mouse already works and has better ergonomics.
“any bluetooth mouse” needs to be paired with either a keyboard, or one of those split keyboards, or a gamepad in the other hand and none of those are very conducive to playing a game from the couch.
I’ll admit I haven’t tried the MouseMode at all, let alone on my lap or on the couch next to me but it sounds extremely novel and likely to catch on if it could work well.